alt Hacker Newsyeah, and then you need to get refreshed orbital elements for those satellites. not good if you are in an airtight environment.
celestial ephemerides don't change nearly as much.
yeah, and then you need to get refreshed orbital elements for those satellites. not good if you are in an airtight environment.
celestial ephemerides don't change nearly as much.
No problem, in a few hours orbits of satellites don't change much, a day or two days' old ephemeris are ok. Especially not those on medium earth orbits which are the ones to be used (geostationary and other high orbital ones are too dim + too far away to provide precise coordinates; low orbit ones are not visible most of the night)